Abstract: 5-Nitroisatin is reacted with sodium hydroxide to produce an &agr;-keto acid sodium salt that is reduced with borane-tetrahydrofuran complex and then hydrogenated to produce 1-(2,5-diaminophenyl)ethylene glycol, a novel compound useful as a primary intermediate in the production of oxidative hair dyes.

Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula at least one coupler comprising a compound of the formula: wherein R is selected from the group consisting of C1 to C2 alkyl and hydroxyethyl, R1 is selected from the group consisting of hydrogen, chlorine, bromine, C1 to C3 alkyl, C1 to C3 alkoxy, C1 to C3 hydroxyalkyl and C1 to C3 hydroxyalkoxy, and X is O, S or NH.

Abstract: The invention provides compositions and methods for the oxidative coloring of human hair. The compositions of the invention contain as a primary intermediate at least one aminophenol of the formulas: ##STR1## or a cosmetically acceptable salt thereof, and at least one pyrazolone coupler of the formulas: ##STR2## or a cosmetically acceptable salt thereof. The compositions may also contain one or more other primary intermediates and conventional coupling compounds, in addition to an oxidizing agent and other components typically used in oxidative hair dye preparations.

Abstract: Compounds of Formula II ##STR1## wherein R.sub.3 is --COOCH.sub.3, --COCH.sub.3 or --COCH.sub.2 CH.sub.3 and R.sub.4 is hydrogen or R.sub.3 is hydrogen and R.sub.4 is --OCH.sub.3, --OC.sub.2 CH.sub.3, --OCH.sub.2 CH.sub.2 OH or --OCH.sub.2 CH.sub.2 OCH.sub.3 are storage stable and can be used in oxidative hairdye systems in place of the storage unstable 2-methyl-1-naphthol. Advantageously, it has been found to produce the same colors as 2-methyl-1-naphthol.

Abstract: Compositions and methods for the oxidative coloring of human hair, wherein the compositions contain as a novel primary dye intermediate a 1-(4-aminophenyl)-2-pyrrolidinemethanol, or a cosmetically acceptable salt thereof. The compositions may also contain at least one other primary intermediate and conventional coupling compounds, in addition to an oxidizing agent and other components typically used in oxidative hair dye preparations. A preferred dye intermediate in the composition is 1-(4-aminophenyl)-2-pyrrolidinemethanol or cosmetically acceptable salts thereof, which produce intense black colors when used in admixture with a suitable coupling agents, such as 3-aminophenol, in conventional hair dye base formulations.

Abstract: A 2-Substituted-1-naphthol of the formula: ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.6 alkyl or monohydroxy C.sub.1 -C.sub.6 alkyl couples with a primary intermediate of the formula: ##STR2## wherein R is C.sub.1 -C.sub.6 alkyl or monohydroxy C.sub.1 -C.sub.6 alkyl to produce an oxidative dye.

Abstract: Anthraquinone compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 are methyl and R.sub.3 is propyl, or R.sub.1 and R.sub.2 are ethyl and R.sub.3 is methyl and A is a cosmetically acceptable anion, are combined neutral, with semipermanent direct dyes in hair dyeing compositions.

Abstract: N-(4-Aminophenol) prolineamide and cosmetically acceptable salts thereof are useful as primary intermediates in oxidative hair dyeing. Compositions which contain a hair dye produced by oxidatively coupling N-(4-aminophenol) prolineamide with a coupler in the presence of an oxidizing agent are applied to the hair in oxidative hair dyeing processes.

Abstract: A 2-Substituted-1-naphthol of the formula: ##STR1## wherein R.sub.3 is C.sub.1 -C.sub.6 alkyl or monohydroxy C.sub.1 -C.sub.6 alkyl couples with a primary intermediate of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are each independently C.sub.1 -C.sub.6 alkyl to produce an oxidative dye.

Abstract: Compounds of Formula II ##STR1## wherein R.sub.3 is --COOCH.sub.3, --COCH.sub.3 or --COCH.sub.2 CH.sub.3 and R.sub.4 is hydrogen or R.sub.3 is hydrogen and R.sub.4 is --OCH.sub.3, --OCH.sub.2 CH.sub.3, --OCH.sub.2 CH.sub.2 OH or --OCH.sub.2 CH.sub.2 OCH.sub.3 are storage stable and can be used in oxidative hairdye systems in place of the storage unstable 2-methyl-1-naphthol. Advantageously, it has been found to produce the same colors as 2-methyl-1-naphthol.

Abstract: A one pot process is provided in which a Mannich base of the formula 5 is reacted with acetic anhydride to produce a diacetate derivative. Without any intermediate isolation, the derivative is hydrogenated to produce a reaction mixture containing 1-acetoxy-2-methylnaphthalene which is readily precipitated from the reaction mixture by addition of water.

Abstract: Compounds of Formula II ##STR1## wherein R.sub.3 is --COCH.sub.3, --COCH.sub.3 or --COCH.sub.2 CH.sub.3 and R.sub.4 is hydrogen or R.sub.3 is hydrogen and R.sub.4 is --OCH.sub.3, --OCH.sub.2 CH.sub.3, --OCH.sub.2 CH.sub.2 OH or --OCH.sub.2 CH.sub.2 OCH.sub.3 are storage stable and can be used in oxidative hairdye systems in place of the storage unstable 2-methyl-1-naphthol. Advantageously, it has been found to produce the same colors as 2-methyl-1-naphthol.

Abstract: Anthraquinone compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 are methyl and R.sub.3 is propyl, or R.sub.1 and R.sub.2 are ethyl and R.sub.3 is methyl and A.sup.- is a cosmetically acceptable anion, are useful for the dyeing of hair. Compounds of formula I may advantageously be employed with direct dyes. Compositions and a method of use employing same are disclosed.

Abstract: A method of producing and isolating 5,6-diacetoxyindole (DAI) in a single reaction vessel comprising the following steps:(a) preparing a first solution comprising dopa, water and a solubilizing agent selected from the group consisting of an acid having a pk.sub.a value equal to or less than 4 and a first base having a pk.sub.b value equal to or greater than 10;(b) preparing a second solution comprising an oxidant, a buffer and water;(c) mixing the first and second solutions to form a combined solution which is rendered oxygen-free and has a pH of from about 6 to about 9;(d) stirring the combined solution in an inert atmosphere until 5,6-dihydroxyindole (DHI) is substantially completely formed;(e) adding a derivatizing agent and a second base to the combined solution to form a final solution;(f) stirring the final solution until the DHI is substantially fully consumed;(g) cooling the final solution to precipitate DAI;(h) isolating the precipitated DAI.

Abstract: A hair fiber having a first color is contacted with a dye having the formula I, formula II, formula III or a mixture thereof whereby the fiber has imparted to it a second color, upon subsequent contact with alkaline peroxide the visual appearance of the first color is restored to the fiber.

Abstract: 4-Halo-1-naphthol is reacted with a secondary amine and formaldehyde to produce a reaction mixture containing a Mannich base which is hydrogenated to produce 2-methyl-1-naphthol. Advantageously, the procedure can be carried out in one pot.

Abstract: 2-substituted-1-naphthols when coupled with an oxidation dye precursor in an oxidative dye system produce a long lasting intense color to hair. Use of such couplers makes available to the colorist novel oxidation hair dyes which surprisingly show a color shift to the red. Dyestuffs prepared through use of the 2-substituted-1-naphthol couplers are substantially more acid-fast compared to like dyestuffs using a 1-naphthol coupler. Compositions and a method of dyeing hair are also disclosed.

Abstract: An indole of the formula ##STR1## wherein R.sub.5 and R.sub.6 are acetoxy or hydrogen, at least one of R.sub.5 and R.sub.6 being acetoxy, is prepared, in good yield, in a one pot synthesis, without extraction, recrystallization or isolation of intermediate reaction product; A compound of the formula ##STR2## wherein R.sub.1 and R.sub.2 are benzyloxy or hydrogen, provided that at least one of R.sub.1 and R.sub.2 is benzyloxy, is subjected to reductive cyclization followed by acetylation of the resultant reaction product.

Abstract: N.sup.1 -Trifluoroalkyl substituted 2-nitro-p-phenylenediamines, compositions containing same, and their use as direct dyes for keratinous fibers are disclosed.

Abstract: 1,5-diamino-2,4-bis(2,2,2-trifluoroethoxy) benzene is a novel m-phenylenediamine coupler and oxidative dye compositions containing same. Stronger dyeing intensity is afforded by use of the novel coupler of the invention.